A163004 - OEIS

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A163004 as a simple table

n	a(n)
1	1
2	20
3	234
4	2423
5	24455
6	245972
7	2473317
8	24868730
9	250043151
10	2514035445
11	25277060955
12	254144975454
13	2555267942068
14	25691612225457
15	258313003017344
16	2597174783771339
17	26112958991681036
18	262549379235881855

[1,20,234,2423,24455,245972,2473317,24868730, 250043151,2514035445,25277060955,254144975454, 2555267942068,25691612225457,258313003017344, 2597174783771339,26112958991681036, 262549379235881855]